I saw this post but I didn't want to say anything becuase I've never experienced exactly what you say is the problem you're having. However the above poster is right, I have had problems with pinholing etc., with PMK, but as soon as I got rid of stop bath altogether (I just use water with continuous agitation for 1-1/2 minutes), my negatives have been fine.(posted 9040 days ago)Try a water only stop bath and see what happens. I've also tried to take it to the n-th degree by using a fixer that doesn't contain any acetic acid, too (Kodak F24); and while I'm not quite sure whether it is truly helpful or not, my results have been fine...and the less chemicals the better, right? Then again, you are using pyro...!